| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.struts2.result; |
| |
| import com.opensymphony.xwork2.ActionContext; |
| import com.opensymphony.xwork2.ActionInvocation; |
| import com.opensymphony.xwork2.Result; |
| import com.opensymphony.xwork2.util.TextParseUtil; |
| import com.opensymphony.xwork2.util.ValueStack; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| import org.apache.struts2.ServletActionContext; |
| |
| import javax.servlet.http.HttpServletResponse; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * <!-- START SNIPPET: description --> |
| * <p> |
| * A custom Result type for setting HTTP headers and status by optionally evaluating against the ValueStack. |
| * This result can also be used to send an error to the client. All the parameters can be evaluated against the ValueStack. |
| * </p> |
| * |
| * <!-- END SNIPPET: description --> |
| * <p> |
| * <b>This result type takes the following parameters:</b> |
| * </p> |
| * <!-- START SNIPPET: params --> |
| * |
| * <ul> |
| * |
| * <li><b>status</b> - the http servlet response status code that should be set on a response.</li> |
| * |
| * <li><b>parse</b> - true by default. If set to false, the headers param will not be parsed for Ognl expressions.</li> |
| * |
| * <li><b>headers</b> - header values.</li> |
| * |
| * <li><b>error</b> - the http servlet response error code that should be set on a response.</li> |
| * |
| * <li><b>errorMessage</b> - error message to be set on response if 'error' is set.</li> |
| * </ul> |
| * |
| * <!-- END SNIPPET: params --> |
| * <p> |
| * <b>Example:</b> |
| * </p> |
| * <pre><!-- START SNIPPET: example --> |
| * <result name="success" type="httpheader"> |
| * <param name="status">204</param> |
| * <param name="headers.a">a custom header value</param> |
| * <param name="headers.b">another custom header value</param> |
| * </result> |
| * |
| * <result name="proxyRequired" type="httpheader"> |
| * <param name="error">305</param> |
| * <param name="errorMessage">this action must be accessed through a proxy</param> |
| * </result> |
| * <!-- END SNIPPET: example --></pre> |
| */ |
| public class HttpHeaderResult implements Result { |
| |
| private static final long serialVersionUID = 195648957144219214L; |
| private static final Logger LOG = LogManager.getLogger(HttpHeaderResult.class); |
| |
| /** |
| * This result type doesn't have a default param, null is ok to reduce noise in logs |
| */ |
| public static final String DEFAULT_PARAM = null; |
| |
| private boolean parse = true; |
| private Map<String, String> headers; |
| private int status = -1; |
| private String error = null; |
| private String errorMessage; |
| |
| public HttpHeaderResult() { |
| super(); |
| headers = new HashMap<>(); |
| } |
| |
| public HttpHeaderResult(int status) { |
| this(); |
| this.status = status; |
| this.parse = false; |
| } |
| |
| /** |
| * Sets the http servlet error code that should be set on the response |
| * |
| * @param error the Http error code |
| * @see javax.servlet.http.HttpServletResponse#sendError(int) |
| */ |
| public void setError(String error) { |
| this.error = error; |
| } |
| |
| /** |
| * Sets the error message that should be set on the reponse |
| * |
| * @param errorMessage error message send to the client |
| * @see javax.servlet.http.HttpServletResponse#sendError(int, String) |
| */ |
| public void setErrorMessage(String errorMessage) { |
| this.errorMessage = errorMessage; |
| } |
| |
| /** |
| * Returns a Map of all HTTP headers. |
| * |
| * @return a Map of all HTTP headers. |
| */ |
| public Map<String, String> getHeaders() { |
| return headers; |
| } |
| |
| /** |
| * Sets whether or not the HTTP header values should be evaluated against the ValueStack (by default they are). |
| * |
| * @param parse <tt>true</tt> if HTTP header values should be evaluated against the ValueStack, <tt>false</tt> |
| * otherwise. |
| */ |
| public void setParse(boolean parse) { |
| this.parse = parse; |
| } |
| |
| /** |
| * Sets the http servlet response status code that should be set on a response. |
| * |
| * @param status the Http status code |
| * @see javax.servlet.http.HttpServletResponse#setStatus(int) |
| */ |
| public void setStatus(int status) { |
| this.status = status; |
| } |
| |
| public int getStatus() { |
| return status; |
| } |
| |
| /** |
| * Adds an HTTP header to the response |
| * |
| * @param name header name |
| * @param value header value |
| */ |
| public void addHeader(String name, String value) { |
| headers.put(name, value); |
| } |
| |
| /** |
| * Sets the optional HTTP response status code and also re-sets HTTP headers after they've |
| * been optionally evaluated against the ValueStack. |
| * |
| * @param invocation an encapsulation of the action execution state. |
| * @throws Exception if an error occurs when re-setting the headers. |
| */ |
| public void execute(ActionInvocation invocation) throws Exception { |
| if (invocation == null) { |
| throw new IllegalArgumentException("Invocation cannot be null!"); |
| } |
| |
| HttpServletResponse response = invocation.getInvocationContext().getServletResponse(); |
| ValueStack stack = invocation.getStack(); |
| |
| if (status != -1) { |
| response.setStatus(status); |
| } |
| |
| if (headers != null) { |
| for (Map.Entry<String, String> entry : headers.entrySet()) { |
| String value = entry.getValue(); |
| String finalValue = parse ? TextParseUtil.translateVariables(value, stack) : value; |
| response.addHeader(entry.getKey(), finalValue); |
| } |
| } |
| |
| if (status == -1 && error != null) { |
| int errorCode = -1; |
| try { |
| errorCode = Integer.parseInt(parse ? TextParseUtil.translateVariables(error, stack) : error); |
| } catch (Exception e) { |
| LOG.error("Cannot parse errorCode [{}] value as Integer!", error, e); |
| } |
| if (errorCode != -1) { |
| if (errorMessage != null) { |
| String finalMessage = parse ? TextParseUtil.translateVariables(errorMessage, stack) : errorMessage; |
| response.sendError(errorCode, finalMessage); |
| } else { |
| response.sendError(errorCode); |
| } |
| } |
| } |
| } |
| } |